Unequivocal Discrimination between Consecutive and Competing Collisionally Induced Decompositions in an Ion Trap

Paradisi, Cristina and Todd, John F.J. and Traldi, Pietro and Vettori, Umberto
(1992)
Unequivocal Discrimination between Consecutive and Competing Collisionally Induced Decompositions in an Ion Trap.
Rapid Communications in Mass Spectrometry, 6
(11).
pp. 641-646.
ISSN 0951-4198.
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Abstract

Discrimination between consecutive and competing collisionally induced decomposition (CID) reactions can easily be obtained by a new procedure consisting of the collisional activation of a parent ion and the simultaneous ejection of one of its daughter ions in an ion trap. This is done by applying, during a single storage phase, a DC voltage appropriate to induce fragmentation ('boundary' activation) of the parent and, at the same time, a 'tickling' RF potential, sufficient to eject a selected daughter ion rapidly from the trap. Several examples are reported which illustrate the capabilities of this procedure in establishing fragmentation pathways e.g., to determine whether a daughter ion is formed in a stepwise process involving an intermediate primary fragment rather than from the direct fragmentation of the parent ion. Salient features of this technique are discussed.